The Two Types of Cathodic Protection Systems

Cathodic protection is a specialty system designed to keep corrosion at bay. It is a process that prevents corrosion from forming on metal surfaces, even in very corrosive environments. It is known to be the most effective form of corrosion protection for many industries. Check out this breakdown of the two types of cathodic protection systems to discover the differences and similarities of each.

Galvanic cathodic protection system

A galvanic cathodic protection system works by utilizing sacrificial anodes. Galvanic corrosion is achieved through an electrical-chemical process that links multiple metals electrically. Its utilization of sacrificial anodes protects the metal structures from galvanic corrosion. The sacrificial anode is a metal anode that is intentionally electrically linked to the structured due to it being more reactive to the corrosive environment than the actual metal. This works to protect the metal structure by allowing the sacrificial anode to become corroded rather than the structure. These sacrificial anodes must be replaced once they are corroded, but this process is long-lasting and successful at protecting structures from corrosion.

Impressed current cathodic protection system

The second type of cathodic protection systems is called an impressed current cathodic protection system, and this type of system is typically used when galvanic cathodic protection systems are not sufficient in preventing corrosion. Impressed current cathodic protection systems are known to protect metal structures even in the most extreme corrosive environments. In an impressed current cathodic protection system, there is a power supply generated to create large differences which allow more current to flow to the metal structure. In a way, this provides a constant stream of protection from corrosion. It is one of the most effective corrosion prevention methods and is extremely long-lasting in nature.

Contact Dreiym Engineering or all of your cathodic protection needs. Our professional engineers can complete a cp survey to help you determine the best course of action to prevent corrosion on your metal structure. We employ a team of educated and certified engineers that will work with you to come up with a plan that best protects your structures from the harmful effects of corrosion.